Die for drawing metal rods



(N0 Model.)

J. AGNEW. DIE FOR DRAWING METAL RODS.

Patented Apr. 29, 1884.

NITED STATES PATENT FFICE.

JOHN AGNEW, OF CUMMINGS, ASSIGNOR TO THE AGNEW SHAFTING GOM- PANY, OF CHICAGO, ILLINOIS.

DIE FOR DRAWING METAL RODS.

SPECIFICATION forming part of Letters Patent No. 297,551, dated April 29, 1884.

Application filed June 18, 1883.

To ctZZ whom it may concern Be it known that I, JOHN AGNEW, of Gummings, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Dies for Drawing Metal Rods or Shafts; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in dies for drawing or reducing shafting or rods of iron or steel of the larger dimensions, as dis- 1 tinguished from wire.

This invention has for its object the strengthening of conical removable drawing-dies; and it consists in certain features of construction hereinafter described, and specifically set forth in the claim.

In the accompanying drawings, Figure 1 is an elevation of the die and its supporting cast-iron frame. Fig. 2 is a vertical axial section taken through the line 00 a: of Fig. 1.

A represents the steel portion of the die,

having a conical exterior surface, and its interior surface of any suitable or desired form for the work to be done. As shown, such inte rior is conical, except in the smaller portion a 0 of the die, which is cylindrical.

B is a heavy cast-metal frame, having a central aperture formed therein, and accurately fitted to receive the steel die A, as indicated in Fig. 2.v The die A is made relatively light 3 5 and thin in proportion to the amount of strain to be imposed upon the same in the operation of drawing the larger class of rods, such as shafting and the like; and so constructed the die may be more cheaply made and more read- 0 ily and evenly tempered or otherwise hardened for the work it is to do. The heavy cast-metal frame B is also cheaply made, and fitted to closely receive the die, and by supportingthe die by such heavy mass of cast metal all needful' strength is given to the structure as a whole for resistance to expansive strain in operation. Making the contiguous surfaces of the parts A and B conical, and tapering in the direction of draft in use, as shown, the steel portion is drawn into the cast-metal frame so tightly that it is impossible for said steel portion to break independently of said frame; or, in other words, the die proper is re-cnforced (No model.)

[ by the entire strength of said surrounding frame. As the bulk of the latter in no Way interferes with the suitable hardening of the I die proper, it may be made of any size necessary to insure its stability.

The die A may taper more gradually than shown in Fig. 2; but it is necessary to this invention. that the die shall have a certain amount of taper in order that it may be forced into close contact with the walls of the aperture in the surrounding cast-metal frame, as above set forth. IVhen slightly tapered, the die may advantageously be provided with a flange, a, on its larger portion, shouldering against the cast-iron frame, either exterior thereto or sunk into the frame, as indicated by dotted lines in Fig. 2. In this case the flange will be so located as to come into hearing only after the conical portion of the die has been forced inward far enough to insure the united resistance of both parts A and B to outward strain, and said flange, upon then striking the dieframe B, will operate to prevent further wedging strain by the cone A calculated to burst the frame, the elasticity of the several parts being sufficient to preserve the unity of their resisting force.

Owing to the conical form of the surfaces of the parts A and B in contact, the part or die proper, A, is readily removable from the frame, and a single frame will therefore serve for any desired number-of dies having the same exterior dimensions, but differing in interior size, as may be required. The conical surfaces in contact should obviously be accurately and smoothly finished.

I claim as my invention The internal die having an internal conical compressing-bore terminating in a plain cylindrical drawing or sizing face, a, an exterior flange, a, and an exterior conical form of less slant than its interior bore, whereby the drawing or sizing bore a is backed by thicker wall or strengthened against stress and wear, substantially as shown and described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

JOHN AGNEW. 

